schmidt



(No Model.) 3 Sheets-Sheet 1.

- 0. SCHMIDT.

AUTOMATIC WBIGHING SCALE FOR GRANULATED AND PULVBRIZED SUB STANGES.

Patented May 25 mi mnms vz-rsn', o0, mom-Una, wAsHlNGYoN, a o.

(No Model.) '3 SheetsSheet 2.

O. SCHMIDT. AUTOMATIC WBIGHING SCALE FOR GRANULATED AND PZULVERIZEDSUBSTANCES.

No. 583,390. Patented May 25,1897.

14. T/VEJ SE 3 1 I117 kZl/k' TOIZ (No Model.) 3 Sheets-Sheet 8.

C. SCHMIDT.

AUTOMATIC WEIGHING SCALE FOR GRANULATED AND PULVERIZED SUBSTANCES.

N0. 583,39 Patented Ma 25,1897.

UNITED STATES PATENT OEETcE.

CARL SCHMIDT, OF BERLIN, GERMANY.

AUTOMATIC WEIGHING-SCALE FOR GRANULATED AND PULVERIZED SUBSTANCES.

SPECIFICATION forming part of Letters Patent No. 583,390, dated May 25,1897'.

Application filed January 31,1895. Serial No. 536,775. (No modeL)Patented in Germany August 30, 1894, No. 80,093; in France October 17,1894,110. 242,253; in England January 23,1895,N0.1,6013 in Austria June7,1895,N0.45/2,046,

and in Hungary November 28, 1895, No. 4,506.

To ctZZ whom it may concern:

Be it known that I, CARL SCHMIDT, a citizen of Germany, residing inBerlin, in the Kingdom of Prussia, in the Empire of Germany, haveinvented certain new and useful Improvements in Automatic Veighing-Scales for Granulated and Pulverized Substances, (for which LettersPatent have been granted in Germany, No. 80,093, dated August 30, 1894:;in France, No. 242,253, dated October 17, 1894; in Austria, No. 45/2046,dated June '7, 1895; in Hungary, No. 4:,506, dated November 23, 1895,and in England, No. 1, 601, dated January 23, 1895,) of which thefollowing is a specification.

The object of this invention is an improved machine for automaticallyweighing predetermined quantities of granular or pulverized substancesin which by a novel and improved construction by means of a leveroperated by hand and suitable connecting mechanisms the operative partsof the machine are set in such a manner that an automatic supply of thematerial into the scale-pan takes place, the accurate weighing of thequantity required is produced by an auxiliary feed device, and after theweighing off of the quantity the antomatic opening of the discharge-gateclosing the bottom of the scalepan takes place, after which all theparts are returned into their initial positions ready for the nextweighing action, said parts being so arranged that during thealternating functioning of the diiferent mechanisms no back action cantake place either on the inflowing material to be weighed or on theoutflowing material after the same has been weighed.

In the accompanying drawings, Figure 1 represents a side elevation of myimproved automatic weighing-machine in which parts are broken away andin which the machine is shown immediately before the commencement of theoutflowing of the material to be weighed. Fig. 2 is a front elevation ofthe machine in which also some of the parts are broken away. Fig. Sis avertical longitudinal section, partly in elevation. Fig. 4 is a detailview of the scale-beam and other adjacent parts, and Fi 5 is a detailsectional view of the feed-roller and pulley.

Similar letters of reference indicate corresponding parts.

Referring to the drawings, A represents the weighing-beam, by which onknife-edge a, supported in hearings of frame E, is suspended thescale-pan B B and on knife-edge a the coun terbalancing-weight O. Theknifeedges or a are located in one straight line with the centralknife-edge or fulcrum a, on which the weighing-beam oscillates. \Viththe scale pan B B is connected a side pocket Z), which are both closedby a bottom discharge-gate D, that turns on a pivot d, turning inbearings of hangers d on the scale-pan and which is provided with aeounterbalancing weight (1. Above the scale-pan B B is arranged on thestationarysupporting-frame E a supply-hopper F, with a small auxiliaryside hopper f, which latter serves for supplying the side pocket Z).hopper F and the upper end of the scale-pan B is arranged a flathorizontal slide-plate G, which is guided in suitable ways g of theframe E and which is operated by the handlever connection ll 7L.

The lower edges of the supply-hopper F are provided with brushes f,which bear on the upper side of the horizontal slide-plate G. To theunder side of the slide-plate G are at tached angular latches g, whichserve for the purpose of locking the weighing-beam when the slide-plateG has been moved beyond the supply-opening of the hopper F, said angularlatches engaging a pin a on the weighingbeam.

Below the auxiliary supplyhopper /"is arranged a feed device whichconsists of v a roller 1, which is supported in bearings of thesupporting-frame E and which is provided with enlarged disk-shaped headsthat form circumferential 'tlangesj, by which the outlet-opening of theauxiliary hopper fis closed at two sides, while the third and fourthsides are closed by a stationary brush K, which is attached to theauxiliary hopper f, and by an opposite oscillating brush L, which turnsin the nature of a valve on a pivot I. From the brush L extends nearlyat right angles thereto a downwardly-extending arm L, which is providedat its outer end with an antifric- Between the outlet-opening of the atsome distance from the end with a down-- wardly-extending finger Z. Theantifrietionroller Z rests, when the arm Z is in its highest position,on the shoulder m of an elbow-lever M, which is pivoted to thesupporting-frame E at m The hand-lever It is pivoted at 7t to the lowerpart of the supporting-frame E, the pivot extending transversely fromone side of the frame to the other, as shown in Fig. Besides theupwardly extending slide-actuating arm 7L the hand-lever II is providedwith the levers O and R, which are located at opposite sides of theframe and rigidly connected to the transverse pivot 7t, so that theyparticipate in the motion of the le- Ver H. The lever O is provided withan upwardly-eatending arm n, which latter forms, by its upper inclinedend, contact with the finger I of the arm Z, whereby the latter is movedin upward direction. The axle of the feed-roller J carries adjacent tothe latter a loose pulley '2', which is provided with a pcripheralgroove for guiding a cord 2', which cord is connected at one end to theouter end of the gravitating lever N, and which is attached at its otherend to the outer end of the lever O, as shown in Figs. 1 and 4-, saidlever holding the cord t" taut by its own weight. The lever N is looseon the pivot or shaft 71', so that by its weight it may hold the cord iftense and at the same time cause the necessary friction between the cordand the pulley i in turning. At diametrically opposite points on theouter side flange of the feedroller J are arranged two pawls 2"", whichact on the circumference of the loose pulley i and which carry along thefeed-roller during the turning of the pulley in one direction, whileduring the turning of the pulley in the opposite direction the lockingaction between the pawls and the pulley is discontinued, and thefeed-roller is thus permitted to remain at rest. The lever O has two differeut functions to fillfirst, to cause the movement of the pulley,and, second, by means of the arm a to move arm Z upon the nose m of theelbowlever l The carrying alongol' the feed-roller .T can also beaccomplished by other means than by the pawls shown--as, for instance,by means of a gear or chain and sprocket-wheel connection but in allcases the actuating motion has to be supplied by the automatic downwardor return motion of the hand-lever ll.

The discharge-gate D is retained in closed position by means of a lever1, which is pivoted at P to the side wall of the scale-pan l) B andwhich forms atp a latch, with which a pin d of the gate 1) engages forsupporting the gate. To the top of the frame E is pivoted at c adownwardly-extendin g arm Q, the lower end q of which is bent at asuitable inclination, as shown clearly in F ig. 1. The lever R, which isapplied to the transverse pivot-rod h, serves to engage by its pin r thelower inclined end (1 of the lever Q and to move the same at the end ofits downward motion out of its initial position, so as to act on apin 1) on the lever 1, whereby the latter is moved away from thereceiving-chamber l3 13, so that its latch 19 releases the pin (Z of thegate D. At one side of the supportingframe E and at. the lower part ofthe same is pivoted at c the cylinder S of a pneumatic brake, thepiston-rods of which is connected with an arm ha of the hand-lever II,which is shown in dotted lines back of the cylinder S in Fig. 1 and infull lines alongside of the same in Fig. 2. For the purpose of adjustingsmall inaccuracies in the weighing-maehine and producing the reliableand uniform functioning of the same there is fulcrumed to the frame E anauxiliary regulating-arm T, which. carries at one end a sliding weightI, while its outer end is connected with the shoulder on thesuspension-rod U of the counterbalancing-weight C. For permitting thetesting of the uniform quantities to be weighed a toepicce U isfulcrumed at "It to the lower part of the supporting-frame E, whichtoc-giece is provided with a small hand-lever u, so that it can be movedin upward direction against lever 0 and thereby the lever R arrestednear the lower end of its downward motion and prevented from releasingthe latch of the gate D-in other words, for preventing thereby thedischarge of the scale-pan 1; 13. As it is necessary that the quantityof material supplied to the scalepan 13B corresponds to thecounterbalancing-weight O the size of the scale-pan l) B must beadjusted to the specific gravityof the material to be weighed. For thispurpose the scale-pan is rendered adjustable, as shown in Fig. 2, bymaking the same of two parts 13 and l3, which can be telescoped one intothe other, so that the size of the chamber therein can be made smalleror larger, after which the sections l3 13 are firmly con nccted by asuitable clampi ng-screw b which passes through a sleeve 7/ of the lowerpart B and engages a guide-rod Z1, )rojecting from the upper part B.

The operation of my improved .'eighiugmachine is as follows: Thematerial to be weighed is supplied to the hopper F from a suitable binor other receptacle. The lever II is moved by hand in upward directionby taking hold of its handle h until it abuts against the stationary luga projecting laterally from the upper part of the frame E, as shown inFig. 2. During the upward. motion of the hand-lever ll the lever 71,which is provided with a finger 713" at its outer end, is likewiseoscillated and thereby the finger 7t placed in engagement with the nose9 on the outer end of the horizontally-guided slideplate G, so as tomove the same in outward direction and open thereby the outlet-openingof the hopper 1 The material to be weighed flows out from. the hopperinto the scale-pan B 13 until the same is filled and the gradualretarding of the downward motion of the scale-pan takes place. As theoutlet-openin g of the hopper F is smaller than the mouth of thescale-pan B B an outward. spreading of the material from the lower endof the hopper toward the upper part of the scale-pan takes place. Theoutlet-opening of the hopper F is, however, large enough to permit thequick filling of the scale-pan B B until the material arrives near theupper rim of the same, so that the hand-lever II can be released by theattendant immediately after contact with the lug c has been made. Thehand -lever H is oscillated by gravity in downward direction, durinwhich motion the finger 7r at the upper end of the curved arm 7L impartsto the slide-plate G a return motion, by which the same cuts through thematerial, which is arrested between the outlet opening of the hopper andthe mouth of the scale-pan B B and shuts off the outletopening of thehopper from the scale-pan l3 3. During the backward motion of theslideplate G through the material between the outlet-opening of thehopper and the mouth of the scale-pan B 3 the material is gradually cutoff, so as to fill the space at the upper part of the scale-pan anddistribute thereby the piled -up material uniformly over the mouth ofsaid scale-pan. The capacity of the scale-pan B B is so proportionedthat the quantity of the material supplied to the same correspondsnearly to the counterbalaneingweight C. To bring about the accuratecounterbalancing of the contents of the scalepan, the auxiliary feeddevice is automatically started and thereby a small auxiliary supply ofmaterial delivered into the scale-pan l3 B. This is accomplished asduring the upward motion of the hand-lever ll the arm n strikes thefinger Z and the arm 1 is raised into its highest position in which itis retained by the nose m of the elbow-lever M. B y the lifting motionimparted to the arm Z the brush L is oscillated, so that an opening isproduced between the auxiliary feed-hopper f and the feed-roller J,through which the material in the auxiliary hopper f is conducted intothe side pocket Z),whieh, however, takes place only from the moment whenthe lever O, which is lowered with the returning hand-lever ll, causes,by the cord t" and the pulley i, the turning of the feedroller J. Assoon as by the supply of the auxiliary feed to the pocket Z) thecounterbalancing of the weight 0 takes place the upward]y-extending pin0, applied to the suspension-rod O of the counterbalancing-weight C,engages the outwardlyextending arm on of the elbow-lever M and releasesthereby the arm Z from the nose on, on the lower arm of the lever M, sothat thereby the brush L is returned into lowermost position and intocontact with the feedroller J to prevent the further supply of material.As soon as the supply of the material to the side pocket Z) is completedthe dischargegate D is released by the action of the downward motion ofthe arm R (which is returned with the descending hand-lever H) upon thependent lever Q, which releases the latchlever P and permits thereby thedropping of the gate D, so that the material in the scalepan B B and thepocket I) can flow out freely over the gate D and be conducted to theplace where the same is to be stored. As soon as the scale-pan B B andpocket I) are empty the discharge-gate D closes itself automatically bythe action of its counterweight (Z.

During the supply of the material to the scale-pan B B the latch g onthe horizontal slide G engages the pin a" on the weighingbeam A andarrests thereby the latter durin g the time required for the filling ofthe scalepan l3 13. This intermittent locking of the weighing-beam isprovided so that by the momentum of the material supplied to thescale-pan and the pocket Z) the auxiliary supply is not interruptedbefore it is entirely completed. Only when the slide-plate G closes theoutlet-openin g of the hopper F the weighing-beam can play freely andcomplete, in connection with the extra feed, the aceu rate weighingoperation. The pneumatic brake, which is connected by the arm 7L2 withthe lever II, is arranged for the purpose of securing the steady supplyof the auxiliary feed and to likewise produce the slight retarding oithe return motion of the lever system, and in connection therewith theslowing up of the motion of the feed-roller J.

Having thus described my invention, I claim as new and desire to secureby Letters Patent 1. The combination of a supply-hopper, means forsupporting said hopper, a cut-off for the supply-hopper, a weighingmechanism provided with a scale-pan havin g a pocket disposed at oneside thereof at the lower part, and auxiliary feeding means separatefrom and independent of the cut-off of the supplyhopper, said auxiliaryfeeding means being disposed between the auxiliary supply-hopper and theside pocket and supplying additional material into the side pocket ofthe scalepan until the exact; weight is reached.

2. The combination of a supply-hopper, means for supporting said hopper,a cut-oil for the supply-hopper, a weighing mechanism provided with ascale-pan having a pocket disposed at one side and at the lower partthereof, an automatic discharge-gate extending over thedischarge-orifices of both the scale-pan and its pocket, and auxiliaryfeeding means separate from and independent of the cut-off of thesupply-hopper, said feeding means being arranged to supply additionalmaterial to the scale pan until the exact weight is reached.

The combination of a supply-hopper, having an auxiliary feed-hopper atone side, means for supporting said hoppers, a cut-off for thesupply-hopper independent of the auxiliary feed-hopper, a weighingmechanism pro- IIO vided with a scale-pan, and a feed-roller separatefrom the hopper-and disposed between the auxiliary hopper and thescale-pan, said feed-roller being in dependent of the cut-off of thesupply-hopper for permitting a supply of additional material to thescale-pan from the auxiliary feed-hopper until the exact weight isreached.

4:. The combination of a supplyhopper having an auxiliary feed-hopper atone side, means for supporting said hoppers, a cut-off for thesupply-hopper, a Weighing mechanism provided with a scale-pan having aside pocket, and a feed-roller arranged between the auxiliaryfeed-hopper and the side pocket of the scale-pan, said feed-roller beinginclependent of the cut-off of the supply-hopper for discharging anadditional amount of material into the side pocket until the exact fullweight is reached.

5. The combination of a supply hopper having an auxiliary supply-hopperconnected therewith, means for supporting said supplyhoppers, a weighingmechanism provided with a scale-pan having a side pocket, a feedrollerbelow the auxiliary hopper and above the pocket, means for turning theroller, means for inclosing the space between the auxiliary hopper andthe roller, a valve at one side of said space, and means for opening andclosing the valve.

6. The combination of a supply hopper having an auxiliary feedingmedium, means for supporting said hopper and feeding mediu In, aweighing mechanism provided with a scale-pan having a side pocket, afeed-roller having side flanges, means for closing one side of the spacebetween the flanges, a valve for closing the other side of said space,means for operating the valve, and means for rotating the feed-roller.

7. The combination of a supply hopper having an auxiliary feed-hopper,means for supporting said hoppers, aweighing mechanism provided with ascale-pan having a side pocket, a feed roller having side flanges, meansfor closing one side of the space between the flanges, avalve forclosing the other side of said space, said valve being pivoted to theauxiliary hopper, an arm extending from the valve, means for actuatingthe arm of the valve, and means for rotating the feedroller.

8. The combination of a weighing mechanism having a scale-pan, means forfeeding ma terial to the scalepan, a discharge-gate pivotally supportedby the scale-pan, a lever provided with means for supporting the gate inraised position, and with a projecting pin, a

second pivoted lever adapted to engage said pin, and means foroperatin gthe second lever.

9. The combination of aweighing mechanism having a scale-pan, a pivotedhand-lever, and a main feed-controlling mechanism operated by saidhand-lever, and closed by the downward movement thereof, and anauxiliary feed-controlling mechanism opened and closed by thehand-lever.

10. The combination of a weighing mechanism having a scale-pan, apivoted hand-lever, a main feed-controlling mechanism operated by saidhand-lever and closed by the downward movement thereof, an auxiliaryfeedcontrolling mechanism opened and closed by the hand-lever, and adischarge mechanism operated by said hand-lever and opened by thedescent thereof.

11. The combination of a weighing m echanism, having a scale-pan, apivoted hand-lever, a main feed-controlling mechanism operated by saidhand-lever, an auxiliary feed-control ling mechanism opened and closedby said hand-lever, and a pneumatic brake connected to said hand-leverfor retarding the downward movement thereof and permitting the main andauxiliary feed mechanisms to be brought into operation at the propertimes.

12. The combination of a weighin mechanism, having a scale-pan, apivoted hand-lever, a main feed-controlling mechanism operated bysaidhand-lever, an auxiliary feed-controlling mechanism opened and closed bythe descent of said hand-lever, a discharge mechanism adapted to beopened by the descent of said hand-lever, and a pneumatic brakeconnected with said hand-lever for retarding the downward movement ofsaid lever and permitting the mechanisms operated by said hand-lever tobe brought into operation at the proper times.

CARL SCIIHIDT.

Witnesses:

CHAS. H. DAY, CARL TELLscnow.

IIO

